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Global statistics

These statistics are computed automatically from users’ data, which can be inaccurate or incomplete (especially legacy data migrated from the previous LORD version). Therefore, they must be interpreted carefully. For more details, please read the guide.

Demography

Total number of rats 47,842 rats
 ⨽ females  ⨽ 24,555 females (51.33 %)
 ⨽ males  ⨽ 23,287 males (48.67 %)
Rats considered as deceased 44,671 rats (93.4 % of all rats)
 ⨽ declared with known date  ⨽ 21,005 rats (47 % of deceased rats)
 ⨽ presumably dead  ⨽ 23,666 rats (53 % of deceased rats)
Lifespan
 ⨽ average  ⨽ 22.2 months (♀: 22.6 months – ♂: 21.8 months)
 ⨽ average, infant mortality excluded  ⨽ 22.7 months (♀: 23.1 months – ♂: 22.3 months)
 ⨽ average, accidents also excluded  ⨽ 23.5 months (♀: 23.8 months – ♂: 23.1 months)
 ⨽ maximum  ⨽ 4 years, 3 months, 28 days (DS. Cerberus)

Breeding

Total number of ratteries 679 ratteries
 ⨽ active in the last 2 years  ⨽ 30 ratteries (4.42 %)
Average rattery lifetime 904 days (2.5 years)
Average rattery productivity 8.3 litters (43.7 rats)
 ⨽ as birth place  ⨽ 6.6 internal litters
 ⨽ as other contributor  ⨽ 1.7 external litters
Average mother age 233 days (7.6 months)
Average father age 441 days (14.5 months)
Average litter size 6.5 pups (debiased estimation: 10.2 pups)
Average sex ratio 0.985 (about 51 females for 50 males)

Mortality

Median death age 23 months (50 % of rats die before this age, 50 % after)
Death peak 24 months (death occurs more often at this age than any other)
Interquartile interval 16-27 months (50 % of rats die in this age interval)
Leading death category “Other” (26 % of declared deaths)
Leading death cause “*Old age, natural death (from 48 month old minimum)” (23 % of declared deaths)

Death categories

Number of recorded deaths 21,005 rats (47 % of rats considered as dead)
By decreasing frequency * please note that tumours without recorded localization appear as « Autres »
26.04 %
Other
22.96 %
Old age, natural death (from 48 month old minimum)
16.94 %
Unknown cause
11.98 %
Respiratory
7.95 %
Accidents, traumas, poisonings
6.92 %
Neurological (brain, spinal cords, nerves)
2.18 %
Infant mortality (up to 6 week old)
1.11 %
Cardiovascular
1.1 %
Reproductive system
1.08 %
Eye, ear, mouth, face
0.82 %
Digestive
0.66 %
Urinary system (kidney, bladder)
0.24 %
Skin
0.02 %
Muscles and skeleton

Most frequent death causes

Number of deaths with recorded cause 21,005 rats (47 % of rats considered as dead)
By decreasing frequency * for rats recorded as dead without precise cause, death category is used instead
22.96 %
*Old age, natural death (from 48 month old minimum)
16.93 %
Undetermined cause (known date)
15.35 %
Undetermined tumor (affected organ unknown)
7.74 %
*Respiratory
4.92 %
Domestic accident (crush, door...)
4.82 %
Undetermined infection or abscess
4.27 %
Stroke
3.86 %
Bronchitis, pneumonia
3.33 %
*Other
2.2 %
Virus, epidemic outbreak, immune deficiency (SDA, Sendai, Tyzzer...)
1.92 %
*Neurological (brain, spinal cords, nerves)
1.57 %
Veterinary accident (anesthesia during a minor operation, medical error, etc.)
1.09 %
*Infant mortality (up to 6 week old)
1.09 %
Fights, injuries, serious bites, subsequent hemorrhage (excluding abnormal hemorrhage)
0.93 %
Heart failure, valvular disease
0.74 %
Stillborn
0.57 %
Otitis, ear abscess
0.48 %
Complications of gestation or parturition
0.46 %
Renal failure
0.35 %
Pituitary tumor
0.29 %
Intestinal obstruction (excluding megacolon)
0.28 %
Mammary tumor
0.21 %
Epilepsy
0.2 %
Lack of milk
0.18 %
Food poisoning
0.18 %
Hereditary megacolon
0.17 %
Facial tumor (excluding Zymbal tumor)
0.16 %
Uterus infection (metritis, pyometra)
0.16 %
Lung tumor
0.15 %
Zymbal gland tumor
0.13 %
Digestive tumor (stomach, liver, pancreas, intestines...)
0.13 %
Pulmonary edema
0.13 %
Liver failure
0.12 %
Malformation, hydrocephalus
0.11 %
*Urinary system (kidney, bladder)
0.1 %
Other respiratory trouble
0.1 %
Generalized cancer, leukemia, lymphoma
0.1 %
Brain tumor
0.09 %
*Skin
0.09 %
Heart attack, infarct, pulmonary embolism
0.09 %
Pododermatitis
0.08 %
Other tumor (salivary, spleen, adrenal, thyroid...)
0.08 %
Tooth abscess
0.07 %
Heatstroke
0.07 %
Vaginal prolapse (excluding tumors and postpartum)
0.07 %
Uterine tumor
0.06 %
Dental malocclusion
0.05 %
Suffocation, choking
0.05 %
Other heart or vascular problem
0.04 %
Diabetes
0.04 %
Allergy, anaphylactic shock
0.04 %
Other neurological trouble
0.04 %
Other digestive trouble
0.03 %
Falls, fractures, head or spinal cord trauma (excluding fights)
0.03 %
Facial abscess (excluding teeth and Zymbal gland)
0.03 %
Hemorrhage (exaggerated relative to the context, coagulation disorder, hemophilia)
0.03 %
Other known cause fitting no other category
0.03 %
Skin tumor, skin cancer
0.02 %
Urinary or kidney infection
0.02 %
Progressive spinal cord damage, degenerative paralysis
0.02 %
Kidney tumor
0.02 %
Subcutaneous abscess
0.02 %
Bladder tumor
0.02 %
Digestive hemorrhage
0.02 %
Other infant mortality cause
0.02 %
Euthanasia without medical cause
0.02 %
Malnutrition
0.02 %
Sepsis
0.02 %
Other accident or trauma
0.01 %
Digestive abscess
0.01 %
Extensive skin infection (pyoderma, bedsores, etc.)
0.01 %
Vaginal tumor
0.01 %
Urethral obstruction, urinary retention, stones
0.01 %
Other reproductive system disorder
0.01 %
Glaucoma
0.01 %
Brain infection, encephalitis, meningitis
0.01 %
Muscle tumor
0.01 %
Other musculoskeletal trouble
0.01 %
Ovarian tumor
0.01 %
*Cardiovascular
0.01 %
*Eye, ear, mouth, face
0.01 %
*Unknown cause
0.01 %
*Accidents, traumas, poisonings
0 %
Other head related trouble
0 %
Other urinary disorder
0 %
Testicular tumor
0 %
Retro-orbital tumor
0 %
*Reproductive system

Most frequent tumours

Number of tumour-related deaths 3,581 rats (17.05 % of rats with known death cause)
By decreasing frequency * please note that tumour localization could not be recorded before 2023
90.03 %
Undetermined tumor (affected organ unknown)
2.07 %
Pituitary tumor
1.65 %
Mammary tumor
1.01 %
Facial tumor (excluding Zymbal tumor)
0.92 %
Lung tumor
0.87 %
Zymbal gland tumor
0.78 %
Digestive tumor (stomach, liver, pancreas, intestines...)
0.59 %
Generalized cancer, leukemia, lymphoma
0.56 %
Brain tumor
0.45 %
Other tumor (salivary, spleen, adrenal, thyroid...)
0.39 %
Uterine tumor
0.17 %
Skin tumor, skin cancer
0.14 %
Kidney tumor
0.14 %
Bladder tumor
0.08 %
Vaginal tumor
0.06 %
Ovarian tumor
0.06 %
Muscle tumor
0.03 %
Retro-orbital tumor
0.03 %
Testicular tumor
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